Kristen Stewart said that she just had to blush while shooting the racy sex scenes with real-life boyfriend Robert Pattinson in “Breaking Dawn.” The actress reveals that the initial cut of the scene in “Part 1” was, in fact, too hot to receive the desired PG-13 rating and had to be re-edited.

In the new issue of Glamour UK, Stewart opens up about the highly-anticipated sex scenes.

“It was so weird, it didn’t even feel like we were doing a ‘Twilight’ film. I was like, ‘Bella! What are you doing? Wow! What is happening here?!'” she said. “It was very surreal. We [originally] got rated R. They re-cut it.”

“You have to worry about how you’re going to look,” he said to Mexican magazine 15a20. “I had never been so worried about that before, but after seeing how much Taylor [Lautner] works out for the movies, I thought, ‘Well, everybody is really going to judge me now.’ I always tried to think about positions where I could tense the muscles, and suck in my belly.”

In Glamour, Stewart seconds that emotion. “Usually we all make fun of Taylor for working out so often, and then suddenly me and Rob were like ‘(bleep)’ and were running around the block while Taylor laughed at us,” she said of training to look her best sans clothes.